sliceString() - Code Metrics - Inspection of "Lexer optimizations" - digiaonline/graphql-php - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Pull Request — master (#196)

by Christoffer

created 2018-04-09 21:18 UTC

sliceString() A

↳ Parent: Project

Complexity

Conditions	2
Paths	2

Size

Total Lines	4
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
dl	0
loc	4
rs	10
c	0
b	0
f	0
cc	2
eloc	2
nc	2
nop	3

<?php

namespace Digia\GraphQL\Language;

/**
 * @param string $string
 * @param int    $position
 * @return int
 */
function charCodeAt(string $string, int $position): int
{
    static $cache = [];

    $char = \mb_substr($string, $position, 1, 'UTF-8');

    if (!isset($cache[$char])) {
        $cache[$char] = \mb_ord($char);
        $cache[$char] = /** @scrutinizer ignore-call */ \mb_ord($char);
    }

    return $cache[$char];
}

/**
 * @param int $code
 * @return string
 */
function printCharCode(int $code): string
{
    if ($code === 0x0000) {
        return '<EOF>';
    }

    return $code < 0x007F
        // Trust JSON for ASCII.
        ? \json_encode(\mb_chr($code))
        ? \json_encode(/** @scrutinizer ignore-call */ \mb_chr($code))
        // Otherwise print the escaped form.
        : '"\\u' . \dechex($code) . '"';
}

/**
 * @param string   $string
 * @param int      $start
 * @param int|null $end
 * @return string
 */
function sliceString(string $string, int $start, int $end = null): string
{
    $length = $end !== null ? $end - $start : \mb_strlen($string) - $start;
    return \mb_substr($string, $start, $length);
}

/**
 * @param int $code
 * @return bool
 */
function isLetter(int $code): bool
{
    return ($code >= 65 && $code <= 90) || ($code >= 97 && $code <= 122); // a-z or A-Z
}

/**
 * @param int $code
 * @return bool
 */
function isNumber(int $code): bool
{
    return $code >= 48 && $code <= 57; // 0-9
}

/**
 * @param int $code
 * @return bool
 */
function isUnderscore(int $code): bool
{
    return $code === 95; // _
}

/**
 * @param int $code
 * @return bool
 */
function isAlphaNumeric(int $code): bool
{
    return isLetter($code) || isNumber($code) || isUnderscore($code);
}

/**
 * @param int $code
 * @return bool
 */
function isLineTerminator(int $code): bool
{
    return $code === 0x000a || $code === 0x000d;
}

/**
 * @param int $code
 * @return bool
 */
function isSourceCharacter(int $code): bool
{
    return $code < 0x0020 && $code !== 0x0009; // any source character EXCEPT HT (Horizontal Tab)
}

/**
 * @param string $body
 * @param int    $code
 * @param int    $pos
 * @return bool
 */
function isSpread(string $body, int $code, int $pos): bool
{
    return $code === 46 &&
        charCodeAt($body, $pos + 1) === 46 &&
        charCodeAt($body, $pos + 2) === 46; // ...
}

/**
 * @param string $body
 * @param int    $code
 * @param int    $pos
 * @return bool
 */
function isString(string $body, int $code, int $pos): bool
{
    return $code === 34 && charCodeAt($body, $pos + 1) !== 34;
}

/**
 * @param string $body
 * @param int    $code
 * @param int    $pos
 * @return bool
 */
function isTripleQuote(string $body, int $code, int $pos): bool
{
    return $code === 34 &&
        charCodeAt($body, $pos + 1) === 34 &&
        charCodeAt($body, $pos + 2) === 34; // """
}

/**
 * @param string $body
 * @param int    $code
 * @param int    $pos
 * @return bool
 */
function isEscapedTripleQuote(
    string $body,
    int $code,
    int $pos
): bool {
    return $code === 92 &&
        charCodeAt($body, $pos + 1) === 34 &&
        charCodeAt($body, $pos + 2) === 34 &&
        charCodeAt($body, $pos + 3) === 34; // \"""
}

/**
 * @param string $value
 * @return bool
 */
function isOperation(string $value): bool
{
    return $value === 'query' || $value === 'mutation' || $value === 'subscription';
}

/**
 * @param array $location
 * @return array|null
 */
function locationShorthandToArray(array $location): ?array
{
    return isset($location[0], $location[1]) ? ['line' => $location[0], 'column' => $location[1]] : null;
}

/**
 * @param array $locations
 * @return array
 */
function locationsShorthandToArray(array $locations): array
{
    return array_map(function ($shorthand) {
        return locationShorthandToArray($shorthand);
    }, $locations);
}

/**
 * @param array $array
 * @return string
 */
function block(array $array): string
{
    return !empty($array) ? "{\n" . indent(implode("\n", $array)) . "\n}" : '';
}

/**
 * @param string      $start
 * @param null|string $maybeString
 * @param null|string $end
 * @return string
 */
function wrap(string $start, ?string $maybeString = null, ?string $end = null): string
{
    return null !== $maybeString ? ($start . $maybeString . ($end ?? '')) : '';
}

/**
 * @param null|string $maybeString
 * @return string
 */
function indent(?string $maybeString): string
{
    return null !== $maybeString ? '  ' . preg_replace("/\n/", "\n  ", $maybeString) : '';
}

/**
 * @param string $str
 * @return string
 */
function dedent(string $str): string
{
    $trimmed = \preg_replace("/^\n*|[ \t]*$/", '', $str); // Remove leading newline and trailing whitespace
    $matches = [];
    \preg_match("/^[ \t]*/", $trimmed, $matches); // Figure out indent
    $indent = $matches[0];
    return \str_replace($indent, '', $trimmed); // Remove indent
}


digiaonline / graphql-php

Pull Request — master (#196)

sliceString() A

Complexity

Size

Duplication

Importance

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